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src/hotspot/share/memory/metaspace.cpp

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 163     *can_retry = true;
 164   }
 165   size_t prev_value = Atomic::cmpxchg(new_value, &_capacity_until_GC, old_capacity_until_GC);
 166 
 167   if (old_capacity_until_GC != prev_value) {
 168     return false;
 169   }
 170 
 171   if (new_cap_until_GC != NULL) {
 172     *new_cap_until_GC = new_value;
 173   }
 174   if (old_cap_until_GC != NULL) {
 175     *old_cap_until_GC = old_capacity_until_GC;
 176   }
 177   return true;
 178 }
 179 
 180 size_t MetaspaceGC::dec_capacity_until_GC(size_t v) {
 181   assert_is_aligned(v, Metaspace::commit_alignment());
 182 
 183   return Atomic::sub(v, &_capacity_until_GC);
 184 }
 185 
 186 void MetaspaceGC::initialize() {
 187   // Set the high-water mark to MaxMetapaceSize during VM initializaton since
 188   // we can't do a GC during initialization.
 189   _capacity_until_GC = MaxMetaspaceSize;
 190 }
 191 
 192 void MetaspaceGC::post_initialize() {
 193   // Reset the high-water mark once the VM initialization is done.
 194   _capacity_until_GC = MAX2(MetaspaceUtils::committed_bytes(), MetaspaceSize);
 195 }
 196 
 197 bool MetaspaceGC::can_expand(size_t word_size, bool is_class) {
 198   // Check if the compressed class space is full.
 199   if (is_class && Metaspace::using_class_space()) {
 200     size_t class_committed = MetaspaceUtils::committed_bytes(Metaspace::ClassType);
 201     if (class_committed + word_size * BytesPerWord > CompressedClassSpaceSize) {
 202       log_trace(gc, metaspace, freelist)("Cannot expand %s metaspace by " SIZE_FORMAT " words (CompressedClassSpaceSize = " SIZE_FORMAT " words)",
 203                 (is_class ? "class" : "non-class"), word_size, CompressedClassSpaceSize / sizeof(MetaWord));


 385 }
 386 
 387 static void dec_stat_nonatomically(size_t* pstat, size_t words) {
 388   assert_lock_strong(MetaspaceExpand_lock);
 389   const size_t size_now = *pstat;
 390   assert(size_now >= words, "About to decrement counter below zero "
 391          "(current value: " SIZE_FORMAT ", decrement value: " SIZE_FORMAT ".",
 392          size_now, words);
 393   *pstat = size_now - words;
 394 }
 395 
 396 static void inc_stat_atomically(volatile size_t* pstat, size_t words) {
 397   Atomic::add(pstat, words);
 398 }
 399 
 400 static void dec_stat_atomically(volatile size_t* pstat, size_t words) {
 401   const size_t size_now = *pstat;
 402   assert(size_now >= words, "About to decrement counter below zero "
 403          "(current value: " SIZE_FORMAT ", decrement value: " SIZE_FORMAT ".",
 404          size_now, words);
 405   Atomic::sub(words, pstat);
 406 }
 407 
 408 void MetaspaceUtils::dec_capacity(Metaspace::MetadataType mdtype, size_t words) {
 409   dec_stat_nonatomically(&_capacity_words[mdtype], words);
 410 }
 411 void MetaspaceUtils::inc_capacity(Metaspace::MetadataType mdtype, size_t words) {
 412   inc_stat_nonatomically(&_capacity_words[mdtype], words);
 413 }
 414 void MetaspaceUtils::dec_used(Metaspace::MetadataType mdtype, size_t words) {
 415   dec_stat_atomically(&_used_words[mdtype], words);
 416 }
 417 void MetaspaceUtils::inc_used(Metaspace::MetadataType mdtype, size_t words) {
 418   inc_stat_atomically(&_used_words[mdtype], words);
 419 }
 420 void MetaspaceUtils::dec_overhead(Metaspace::MetadataType mdtype, size_t words) {
 421   dec_stat_nonatomically(&_overhead_words[mdtype], words);
 422 }
 423 void MetaspaceUtils::inc_overhead(Metaspace::MetadataType mdtype, size_t words) {
 424   inc_stat_nonatomically(&_overhead_words[mdtype], words);
 425 }




 163     *can_retry = true;
 164   }
 165   size_t prev_value = Atomic::cmpxchg(new_value, &_capacity_until_GC, old_capacity_until_GC);
 166 
 167   if (old_capacity_until_GC != prev_value) {
 168     return false;
 169   }
 170 
 171   if (new_cap_until_GC != NULL) {
 172     *new_cap_until_GC = new_value;
 173   }
 174   if (old_cap_until_GC != NULL) {
 175     *old_cap_until_GC = old_capacity_until_GC;
 176   }
 177   return true;
 178 }
 179 
 180 size_t MetaspaceGC::dec_capacity_until_GC(size_t v) {
 181   assert_is_aligned(v, Metaspace::commit_alignment());
 182 
 183   return Atomic::sub(&_capacity_until_GC, v);
 184 }
 185 
 186 void MetaspaceGC::initialize() {
 187   // Set the high-water mark to MaxMetapaceSize during VM initializaton since
 188   // we can't do a GC during initialization.
 189   _capacity_until_GC = MaxMetaspaceSize;
 190 }
 191 
 192 void MetaspaceGC::post_initialize() {
 193   // Reset the high-water mark once the VM initialization is done.
 194   _capacity_until_GC = MAX2(MetaspaceUtils::committed_bytes(), MetaspaceSize);
 195 }
 196 
 197 bool MetaspaceGC::can_expand(size_t word_size, bool is_class) {
 198   // Check if the compressed class space is full.
 199   if (is_class && Metaspace::using_class_space()) {
 200     size_t class_committed = MetaspaceUtils::committed_bytes(Metaspace::ClassType);
 201     if (class_committed + word_size * BytesPerWord > CompressedClassSpaceSize) {
 202       log_trace(gc, metaspace, freelist)("Cannot expand %s metaspace by " SIZE_FORMAT " words (CompressedClassSpaceSize = " SIZE_FORMAT " words)",
 203                 (is_class ? "class" : "non-class"), word_size, CompressedClassSpaceSize / sizeof(MetaWord));


 385 }
 386 
 387 static void dec_stat_nonatomically(size_t* pstat, size_t words) {
 388   assert_lock_strong(MetaspaceExpand_lock);
 389   const size_t size_now = *pstat;
 390   assert(size_now >= words, "About to decrement counter below zero "
 391          "(current value: " SIZE_FORMAT ", decrement value: " SIZE_FORMAT ".",
 392          size_now, words);
 393   *pstat = size_now - words;
 394 }
 395 
 396 static void inc_stat_atomically(volatile size_t* pstat, size_t words) {
 397   Atomic::add(pstat, words);
 398 }
 399 
 400 static void dec_stat_atomically(volatile size_t* pstat, size_t words) {
 401   const size_t size_now = *pstat;
 402   assert(size_now >= words, "About to decrement counter below zero "
 403          "(current value: " SIZE_FORMAT ", decrement value: " SIZE_FORMAT ".",
 404          size_now, words);
 405   Atomic::sub(pstat, words);
 406 }
 407 
 408 void MetaspaceUtils::dec_capacity(Metaspace::MetadataType mdtype, size_t words) {
 409   dec_stat_nonatomically(&_capacity_words[mdtype], words);
 410 }
 411 void MetaspaceUtils::inc_capacity(Metaspace::MetadataType mdtype, size_t words) {
 412   inc_stat_nonatomically(&_capacity_words[mdtype], words);
 413 }
 414 void MetaspaceUtils::dec_used(Metaspace::MetadataType mdtype, size_t words) {
 415   dec_stat_atomically(&_used_words[mdtype], words);
 416 }
 417 void MetaspaceUtils::inc_used(Metaspace::MetadataType mdtype, size_t words) {
 418   inc_stat_atomically(&_used_words[mdtype], words);
 419 }
 420 void MetaspaceUtils::dec_overhead(Metaspace::MetadataType mdtype, size_t words) {
 421   dec_stat_nonatomically(&_overhead_words[mdtype], words);
 422 }
 423 void MetaspaceUtils::inc_overhead(Metaspace::MetadataType mdtype, size_t words) {
 424   inc_stat_nonatomically(&_overhead_words[mdtype], words);
 425 }


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